Malicious PDF — malware analysis report

Static analysis result for SHA-256 010674ee78c5f763…

MALICIOUS

PDF

88.9 KB Created: 2021-08-07 19:19:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: c153b5c92d518c5903235a06d949ca18 SHA-1: 2c6147743772325a9b918c4b4b4e11cae8d5c7b3 SHA-256: 010674ee78c5f7630358164ec0198f06dab404411fb1c6ccedc62565c17e384e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Multiple heuristics point to the PDF acting as a link farm, directing users to compromised WordPress sites and potentially disposable hosting. The embedded URLs suggest a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://infrive.ru/uplcv?utm_term=manual+de+test+de+matrices+progresivas+de+raven+escala+coloreada+pdf PDF link annotation
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/160b9d9dc0d02b---devavekejesujib.pdfIn PDF document text
    • http://allaboutdowney.com/userimages/jobawokanuzi.pdfIn PDF document text
    • http://hiroi-es.info/yamituki-n/uploads/files/vusuwajavigefowafibumixe.pdfIn PDF document text
    • http://sns.hu/_user/file/nixumibikasufi.pdfIn PDF document text
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/m6mc3c0rou2i448108u405ut1n/21458183940.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d987246b9f6---wofebukutukurabaz.pdfIn PDF document text
    • https://bechtoldpaving.com/wp-content/plugins/super-forms/uploads/php/files/ad6ce203f3c7721a1a2804721f1f6986/96502694925.pdfIn PDF document text
    • http://amsasecretariat.fr/userfiles/file/85417240313.pdfIn PDF document text
    • http://micronforgacsolo.hu/UserFiles/file/34026006465.pdfIn PDF document text
    • https://georeno.ca/userfiles/files/notabopifefesizazelijur.pdfIn PDF document text
    • https://cooperspick.com/files/devilajojiz.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/4ae553e3108a3c5b3a01b6c287724b53/85723180658.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16104302814bbf.pdfIn PDF document text
    • http://yangs-ns.com/ckfinder/userfiles/files/20210530082440.pdfIn PDF document text
    • https://hunde-katzen.at/soubory/kuwetugexifexusuxikaw.pdfIn PDF document text
    • https://centrosteadycam.it/wp-content/plugins/super-forms/uploads/php/files/6c921dc3c6ce6dd6c7695db9be9f3f94/46341322623.pdfIn PDF document text
    • http://salespate.com/userfiles/file/kokivoxaruwowutum.pdfIn PDF document text
    • http://banghetretruc.com/media/ftp/file/fogawalobojamawepareze.pdfIn PDF document text
    • http://fnathservices.com/upload/file/69364931570.pdfIn PDF document text
    • https://khotelmarket.com/FileData/ckfinder/files/20210726_D55C489769D7A4B4.pdfIn PDF document text
    • http://maidnheaven.com/wp-content/plugins/formcraft/file-upload/server/content/files/160921d3de3e01---mezamozojupasoliti.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083271ca567c---16583553702.pdfIn PDF document text
    • http://barahi.com/assets/userfiles/files/64760093932.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f399.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF399 11124 bytes
SHA-256: b78f5b5c6d04da6e30c2117ebe36367892521a54ce39979b415c22e38466e645
font_01_sfnt_off00010d51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D51 18792 bytes
SHA-256: dbf4c4ef1f57c47f81cf4e0f09560b77f8b641c147e8004d3a8029b33da79e9a
font_02_sfnt_off00013d4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D4F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1